Mercurial > hg > nginx
annotate src/os/unix/ngx_posix_init.c @ 7142:b9d919b53593 stable-1.12
Stream: relaxed next upstream condition (ticket #1317).
When switching to a next upstream, some buffers could be stuck in the middle
of the filter chain. A condition existed that raised an error when this
happened. As it turned out, this condition prevented switching to a next
upstream if ssl preread was used with the TCP protocol (see the ticket).
In fact, the condition does not make sense for TCP, since after successful
connection to an upstream switching to another upstream never happens. As for
UDP, the issue with stuck buffers is unlikely to happen, but is still possible.
Specifically, if a filter delays sending data to upstream.
The condition can be relaxed to only check the "buffered" bitmask of the
upstream connection. The new condition is simpler and fixes the ticket issue
as well. Additionally, the upstream_out chain is now reset for UDP prior to
connecting to a new upstream to prevent repeating the client data twice.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Mon, 11 Sep 2017 15:32:31 +0300 |
parents | 56fc55e32f23 |
children | 057adb2a9d23 |
rev | line source |
---|---|
441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
539 | 10 #include <nginx.h> |
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11 |
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12 |
473 | 13 ngx_int_t ngx_ncpu; |
14 ngx_int_t ngx_max_sockets; | |
15 ngx_uint_t ngx_inherited_nonblocking; | |
16 ngx_uint_t ngx_tcp_nodelay_and_tcp_nopush; | |
449
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17 |
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18 |
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19 struct rlimit rlmt; |
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20 |
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21 |
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22 ngx_os_io_t ngx_os_io = { |
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23 ngx_unix_recv, |
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24 ngx_readv_chain, |
1689 | 25 ngx_udp_unix_recv, |
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26 ngx_unix_send, |
6436 | 27 ngx_udp_unix_send, |
6692 | 28 ngx_udp_unix_sendmsg_chain, |
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29 ngx_writev_chain, |
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30 0 |
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31 }; |
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32 |
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33 |
539 | 34 ngx_int_t |
35 ngx_os_init(ngx_log_t *log) | |
455 | 36 { |
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37 ngx_time_t *tp; |
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38 ngx_uint_t n; |
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39 |
539 | 40 #if (NGX_HAVE_OS_SPECIFIC_INIT) |
41 if (ngx_os_specific_init(log) != NGX_OK) { | |
42 return NGX_ERROR; | |
43 } | |
44 #endif | |
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45 |
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46 if (ngx_init_setproctitle(log) != NGX_OK) { |
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47 return NGX_ERROR; |
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48 } |
509 | 49 |
346
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50 ngx_pagesize = getpagesize(); |
589 | 51 ngx_cacheline_size = NGX_CPU_CACHE_LINE; |
346
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52 |
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53 for (n = ngx_pagesize; n >>= 1; ngx_pagesize_shift++) { /* void */ } |
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54 |
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55 #if (NGX_HAVE_SC_NPROCESSORS_ONLN) |
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56 if (ngx_ncpu == 0) { |
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57 ngx_ncpu = sysconf(_SC_NPROCESSORS_ONLN); |
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58 } |
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59 #endif |
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60 |
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61 if (ngx_ncpu < 1) { |
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62 ngx_ncpu = 1; |
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63 } |
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64 |
611 | 65 ngx_cpuinfo(); |
66 | |
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67 if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) { |
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68 ngx_log_error(NGX_LOG_ALERT, log, errno, |
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69 "getrlimit(RLIMIT_NOFILE) failed"); |
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70 return NGX_ERROR; |
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71 } |
577 | 72 |
563 | 73 ngx_max_sockets = (ngx_int_t) rlmt.rlim_cur; |
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74 |
3786 | 75 #if (NGX_HAVE_INHERITED_NONBLOCK || NGX_HAVE_ACCEPT4) |
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76 ngx_inherited_nonblocking = 1; |
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77 #else |
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78 ngx_inherited_nonblocking = 0; |
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79 #endif |
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80 |
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81 tp = ngx_timeofday(); |
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82 srandom(((unsigned) ngx_pid << 16) ^ tp->sec ^ tp->msec); |
800 | 83 |
93
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84 return NGX_OK; |
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85 } |
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86 |
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87 |
539 | 88 void |
89 ngx_os_status(ngx_log_t *log) | |
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90 { |
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91 ngx_log_error(NGX_LOG_NOTICE, log, 0, NGINX_VER_BUILD); |
541 | 92 |
557 | 93 #ifdef NGX_COMPILER |
94 ngx_log_error(NGX_LOG_NOTICE, log, 0, "built by " NGX_COMPILER); | |
95 #endif | |
96 | |
539 | 97 #if (NGX_HAVE_OS_SPECIFIC_INIT) |
98 ngx_os_specific_status(log); | |
99 #endif | |
100 | |
531 | 101 ngx_log_error(NGX_LOG_NOTICE, log, 0, |
461 | 102 "getrlimit(RLIMIT_NOFILE): %r:%r", |
449
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103 rlmt.rlim_cur, rlmt.rlim_max); |
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104 } |
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105 |
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106 |
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107 #if 0 |
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108 |
539 | 109 ngx_int_t |
110 ngx_posix_post_conf_init(ngx_log_t *log) | |
93
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111 { |
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112 ngx_fd_t pp[2]; |
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113 |
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114 if (pipe(pp) == -1) { |
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115 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "pipe() failed"); |
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116 return NGX_ERROR; |
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117 } |
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118 |
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119 if (dup2(pp[1], STDERR_FILENO) == -1) { |
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120 ngx_log_error(NGX_LOG_EMERG, log, errno, "dup2(STDERR) failed"); |
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121 return NGX_ERROR; |
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122 } |
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123 |
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124 if (pp[1] > STDERR_FILENO) { |
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125 if (close(pp[1]) == -1) { |
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126 ngx_log_error(NGX_LOG_EMERG, log, errno, "close() failed"); |
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127 return NGX_ERROR; |
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128 } |
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129 } |
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130 |
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131 return NGX_OK; |
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132 } |
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133 |
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134 #endif |